I think Kilk is right . There must be something dead in there somewhere .You should find it and it should end your problem. It's a health hazard . You should take whatever measures necessary, even removing slates or facia board or whatever needs doing to find the corpse which will be full of crawling maggots which hatch into your bluebottles.
I often wonder when peoplle lay rat poison in a house , where do the rats go to die ? More likely in the house .
Also a tip when spraying a fly in the house.
I use furniture polish usually , but you could use your own mix of something safe and sticky or sugary ,
. When a fly lands
Just spray Two feet above him and then a foot above him and the spray mist will fall about him and will make flying away difficult with sticky wings
Then give him both barrels up close .......Be sure to KILL him and not release outside heh heh
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